1Department of Pediatrics, Oncology, Hematology and Diabetology, Medical University of Lodz, 91-738 Lodz, Poland2Department of Studies on Alcoholism and Other Dependencies, Institute of Psychiatry and Neurology, 02-957 Warsaw, Poland3Students’ Scientific Circle at the Department of Pediatrics, Oncology, Hematology and Diabetology, Medical University of Lodz, 91-738 Lodz, Poland4Department of Pediatrics, Diabetology and Endocrinology, Medical University of Gdańsk, 80-211 Gdańsk, Poland

Received 15 July 2015; Revised 11 October 2015; Accepted 18 October 2015